Sofa



FIG. 1 is a front elevation view of the sofa showing my design.

FIG. 2 is a top plan view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a back view thereof; and,

FIG. 5 is a side view thereof, an opposite side view being a mirror image thereof. 

I claim the ornamental design for a sofa, as shown and described. 